166200552221 has 16 divisors (see below), whose sum is σ = 182253222720. Its totient is φ = 150306199680.

The previous prime is 166200552197. The next prime is 166200552251. The reversal of 166200552221 is 122255002661.

166200552221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 166200552221 - 2⁶ = 166200552157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166200552251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3192815 + ... + 3244451.

It is an arithmetic number, because the mean of its divisors is an integer number (11390826420).

Almost surely, 2^166200552221 is an apocalyptic number.

166200552221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166200552221 is a deficient number, since it is larger than the sum of its proper divisors (16052670499).

166200552221 is a wasteful number, since it uses less digits than its factorization.

166200552221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53164.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 166200552221 its reverse (122255002661), we get a palindrome (288455554882).

The spelling of 166200552221 in words is "one hundred sixty-six billion, two hundred million, five hundred fifty-two thousand, two hundred twenty-one".